Auxiliary air device for explosion engines



Sept. 3, 1929. c. ZANINI AUXILIARY AIR DEVICE FOR EXPLOSION ENGINES Filed NOV. 23, 1928 Fig.3

Patented Sept. 3, 1929.

UNITED STATES CARLO ZANINI, or CAIRO, EGYPT.

AUXILIARY AIR DEVICE FOR EXPLOSION ENGINES.

Application filed November 23, 1928, Serial No. 321,475, and in Italy November. 19, 1927.

This invention relates to an auxiliary air device, more particularlyfor explosion engines cheap and simple in construction and adapted for use in connection with engines and carburetors of any type.

By the use of this device it is possible to send to the engine an absolutely uniform mixture of fuel and air and to automatically proportion this mixture in order to obtain a perfect combustion at any number of turns, with the result of an increased power of the engine and a considerable economy in fuel. This device also prevents scales and deposits in the engine and plugs and drawbacks deriving therefrom and gives an improved elasticity, noiselessness and acceleration.

My auxiliary air device substantially consists of a hollow plate, mounted between the corresponding flanges of the carburettor and of the engine suction pipe and provided with openings on its cylindrical inner surface which is an extension of the suction pipe and with one or more automatic valves opening from the outside towards the flange recess. The underpressure generated by the engine suction causes the automatic valve to open under the action of the outer pressure and air flows through said valve into the plate recess issuing therefrom through the openings on its cylindrical surface and mixing with the mixture arriving from the carburetor and thus affording a thorough mixture and perfect dosing of air with respect to fuel. The valve is such that it opens an air port which automatically enlarges asthe engine suction and therefore the required power increase. I

The accompanying drawing shows by way of example a constructional form of my economizer in connection with an engine having the mouth of the section pipe arranged on a vertical axis.

Figure 1 is an axial section of the device arranged between the flanges of the suction pipe and carburetor.

Figure 2 is a sectional view at rlght angles to Figure 1.

Figures 3 and 4: are sectional views of the. air intake of the device showing the automatic valve in two different positions.

1 denotes the mouth of the engine suction pipe and 2 the carburetor pipe, the carburetor being of any desired construction. The device 3 is in the shape of a hollow plate and is mounted between the flanges 1' and 2' of the engine suction pipe and carburetor pipe, respectively, by using the same bolts 9 hold ing these latter. The plate 3, as clearly shown on the drawing, is hollow and forms an inner chamber limited by the cylindrical inner surface forming an extension of the carburetor and engine suction pipes, Fig. l; by the lateral surface and b the flat upper and lower surfaces. This chamber is traversed by solid parts having holes for the bolts 9 in ter-connecting the flanges (Fig. 2). The inner cylindrical surface has radial openings 4 and the portion of. the lower surface proecting on one side beyond the flanges 1' and 2 carries a conical extension 5 directed downwardly and ending by a mouth 6 closed by a ball 7. The ball 7, of suitable weight, is lifted by virtue of the underpressure generated in the engine when this is started, so that outer air can flow into the flange chamber and through the openings 4 and thoroughly mix with the explosive mixture drawn by the carburetor which it dilutes to the proper extent thus realizing the above mentioned economy in fuel and other advantages, the quantity of air being automatically adjusted in each case in accordance with the number of turns.

At first the free air drawn in is in excess over the explosive mixture arriving from the carburetor and the engine power and speed decrease; this immediately causes a decrease in the underpressure and consequently the lowering of the ball 7 towards its seat, which, owing to the conical shape of the air intake conduit 5 in which the valve 7 is movable, reduces the air quantity. It is clear that according to the number of turns of the engine the ball 7 will automatically take a position in the conical conduit 5 such as to leave a larger or smaller annular air port 8, according to the greater or lower power required by the engine. In other words the ball 7 works as an automatical regulator for the supplementary air.

Starting of the engine may be improved by providing a closure on the mouth 6, e. g., a valve, cock, slide or gate valve which is opened after the engine has been started. This closing member may be operated by the carburetor rod. The-construction shown on the drawing is provided with one intake only for the outer air, but it is obvious that the air intakes may be in the number of two or more, each of them being provided with an automatic valve. This latter in the construction shown consists of a ball and acts by gravity but it can be of any other form or type and act e. g. under the action of a spring, more particularly in engines or carburetors requiring arrangement of flange of economizer on a horizontal axis or in any case when the axis of the conical conduit 7 is other than vertical.

What I claimis:

1. In an auxiliary air supply for internal combustion engines, a hollow, annular plate for insertion between the flanges connecting a carburetter and an engine in-take, said plate having openings in its inner wall and a dependin portion at one side thereof, conical throug out its length, and a gravity Valve closing the bottom inlet to said conical portion.

2. In an auxiliary air supply for internal combustion engines, a hollow annular plate for insertion between the connecting flanges of a carburetter and an engine intake, said plate having openings in its inner wall and a depending tubular portion at one side there of conical throughout its length, directly communicating with the interior of the plate, and a ball actuated by gravity closing the lower end of said depending conical portion.

'In testimony that I claim the foregoing as my invention, I have signed my name.

CARLO ZANINI. 

